Brush-holder for dynamos.



U. H. SMOUT.

BRUSH HOLDER- FGR DYNAMOS.

APPLICATION FILED DEG.14,1906.

l @93,5 l 2"u avtented Sept. 19, mi

C. H. SMOOT.

BRUSH HOLDER POR DYNAMOS.

PPLIGATION FILED '0EG.14, 1906.

1.603,8?? Y v katented sept. 19,1911.

2 SHEETS-SHEET 2.

CHARLES H. SMOGT, OE' CHICAGQ, JJNGIS, ASIGNOR TG BATEAU TURBINE COlli-"llr,

0F CHCAGO, ILLINOS, .L COR-FGRATION 0F "WEST VFRGINE.

BRUSH-RUBBER EUR DYNAMS.

Looser?.

Specificaion of Letters Patent.

@monitori Sepia. i9, ils-Tril.

To all whom it 'may concern:

Be it known that I, Grimme il. Snoer, a citizen of the United States, residing et Chicago, in the county of Cook and Siete of Illinois, have invented a Cert-ain new and useful Improvement in Brush-Holders for Dynamos, of 'which the following is e, full, clear, concise, find erect description.

My Ainvention relates to n brush.A holder ior dynamo electric machines, such. as penereiors and motors, Wholher of ihe. alternating or direct current 'by' e, anc. is more porriculerly intended for use on high speed imxchines, such as elchose which :ire diref'odriven hy steam turbines, and run ai several lhousund revolutions per minnie.. These hiol speed machines :ire very dependent for iheir successful operation upon he period lion of the surface of the coinnniotor or collector, Eind of the eoniaci heir'een such surface and the brushes. ln such machines il no exlrein v dil. :lilla mooier Lo keep lhs hruslcs coninuously in coniooi with die cfnmuulator or collector surfl'fice,hecause i lies in ilu su ce tend toY innige i'fhe nnp oil' che coniinutoior and stoy out of Contact n, suilicienl; Linie io causey sparking.

' in ordinal-5.' iypes oiE in: chinos, il; l; ,irzihle lo use corhon brushes llrecmse lhey iii/.l in securing, u elle-els or sparking :ire less l slruci'ive in mise any should. occur. Dilliculiies have hr-zrehilonf heen experienced in using cerhon brushes on high speed commutatore' on :recount of ihe impossibility of keeping` the oonnnliloor or collecting; surface absolutely true; und ii. il is noi rue the cerhon brushes, 'when used in :my or' he orc'linary forms of brush holder heretofore proposed, will he knocked oui` oli coniuot with. the co miior hv exceedingly sliojhl; sui-lisce lniiries, and ihr give io sparking as ohove described. li an nil'oinptisA inode to make j(he brushes stoy in Contact with the revolving surface of the conimoluor or collector by :applying :i very heavy pressure to ihein, the i'rielion caused hy lho rubbing' of the brushes ut ihe very high peripheral speeds employed will cause hoih ihe comniualor und brushes to become too hot. This will he apparent when it is 'underslooigl that :L peripheral speed of 8000 feet pe: mino :for torino lhe imminent@ is desirable l The present invention provides e. ineens whereby the brushes may be inainziined in coniniious good Contact with the commutator or collector et the high speeds einployed, followingf with the necessary rapidity any slight variations or irregularities in. the rotating' collector surface.

Brozidly, Jdie invention coneinpls'bes i contee-l; brush of ineriio hearing on the collector, and o very siii? spi of groot strengi'h heling upon iihe brush and edjusied io normally press with. only sverage tension thereon, the spring, however, having a. nuurel period of 'vibration considerably higher than the frequency of rotation of the collector, and being4 oilz such stillness that iis Ycnsion is very gresily increased hy only he niinulge. compression due 'io such snmll irregulnriies of elle col.- leelior surface as are oro nurily niet 'with preciic rilhus, 'n prnoice, lhe spi' he of such o s that n oo lhereoi diie' io :in eccenlvricity oi avvii-fem of one per ccnl. in he oolleclor so ace i o;iproxinmtely douille the spring pre 1re. The natural range. o l inoaion oi' such n. spring; will l equal to only a. ieW times the ordinair eccenlrioil'y of the collector.

Another fealore of my invention is o pro- 'rision `or causing such o spring to i ollov.Y nj j the advance of the brush :1s ehe laitier weer" away, so as to maintain :in approxinmlely constant ininin'ioin tension.

rlheinveniion also consiss in certain deioils of construction of n brush holder hovingl 1lhe general chorocierisies' shove described. .Such a brush holder is shown in the accomlmuying oi `n s, in ivlr'hw- Figure l u side eleve onisni laken irnnsversely le e conunuhilor; Fie is a vier-F o: 'irl' holder mechanism 'laken rig` i, ongles lo Fig. l; nud Fig. n perspee ive view oii the mechanism 'for preventing he retraction of lhe spring support-ingarm hereinafter described.

The same letters o reference indicate die same paris in hoi'h views.

The surface of The rotating coininulntor (or collector ring) indieoied hy the are c. The cz'irhon hrush o is held in a inovahle holder or clump l pivoed :it h1 to hei'rime of the hrush holder mechanism, ich is in'l'ended he simo-hed in the os" io rocher su... l

D e (253510K upon said stiff spring' and the brush actuated thereby, Said backing 0r support having moans adapted to follow up the advance of said support and oppose any sudden recession thereof by a resistance additional to the tension of-lihe secondn1entioned spring.

2. The combination with a high speed rotary collector, of a contact. brush hearing thereon, a brush-holder frame, a brush' holding clamp of slight inertia in 'which said brush is secured,` a movable, spring Support inovably mounted on said frame and a coniprossion Spring;r of great strength and stiliness acting between said support and said holding clamp.

3. The combination with a high speed rotary collector, of a Contact brush bearing thereon, a movable holding clamp o' slight inertia in which said brush .is secured, a movable spring support, a compression spring oi great strengthand stillness actingbetiveen said support and said ,holdingclamp, and a ratchet device adapted to nieve said spring support lo follow up the advance of the spring as the brush or the col lector wears away. l

fl. In a brush holder for high speed dynanios, the combination with a pivoted holding clamp in which the carbon brush is adapted to be secured, said clamp being; of slight inertia, of a bell crank lever, a short still com pression-spring acting between one arm of said bell crank lever and said movable holding clan'ip, a ratchet device connected with the other end of said bell crank lever and adapted to permit said lever to advance in a direction to follow up said spring While preventing recession thereof, and a spring l normally tending to advance said lever against the tension of said compression spring.

The combination with a collector, of a brush bearino thereon. a ivoted arin b which said brush, is carried, a spring acting upon said brush, a support for v'said spring relatively movable with respect to said arm, automatic nieans for adjusting said support to maintain an i )proxilnately constant miniininn pressure og the spring upon said brush, and independent means for adjusting the maximum spring pressure.

In Witness whereof, I, hereunto subscribe my naine this 8th day of Decenibev D.,

DE WITT C. TAiiNnR, Amami) H. MOORE. 

